If you were to run a Smith or Fulton receiver, you could build the rest of the gun with NOS TRW parts. The semi-auto receiver would carry a clean Cali serial number. If you watch Gun Broker, you'll find quite a few TRW parts for sale. After assembling most of the action, you could send the rifle into Krieger and have them hand fit a barrel.SF Bay Area for now. That being said the original question didn't require that the firearm in question be legal in my jurisdiction. I'd have to move to Nevada to actually own a Title II firearm.
I already have TRW bolts, an oprod and trigger group. I plan to order a forged LRB receiver at some point but they've been backed ordered for some time. I'll have it assembled onto a McMillian stock that's gathering dust in the closet as well. I do want a hand fitted barrel and I'd like it with a shorter throat and less sloppy neck than I've measured on every factory .308 rifle I've checked.I...If you watch Gun Broker, you'll find quite a few TRW parts for sale. After assembling most of the action, you could send the rifle into Krieger and have them hand fit a barrel.
I've actually considered going this route, as it wouldn't cost too much more than an off the shelf M1A, and in the end, you'd have a more accurate gun.